PHP Cookie值仅在加载2个网页后才有效 [英] PHP cookie value works only after 2 page loads

问题描述

我知道这可能是一个非常初级的问题，但我只是一个月的PHP，所以请承担与我。我试图在WordPress博客中设置一个cookie。 Cookie从URL接收其值。 http://www.xyz.com/?name=John

这是Cookie的设置方式：

  function set_name_cookie（）{
 if（isset（$ _ GET ['name']））{
 $ name = $ _GET ['name' ]; 
 setcookie（name，$ name，time（）+ 3600，/，.xyz.com，false）; 
} 
} 
 add_action（'init'，'set_name_cookie'）; 
  

HTML + PHP：

 <？php if（isset（$ _ COOKIE ['name']））{
 $ name = $ _COOKIE ['name']; 
 echo $ name; 
？> 
< a href =？name = John> John< / a> 
< a href =？name = Smith>史密斯< / a>问题是，当我点击链接John或Smith中的任何一个链接时，都会出现一个错误。页面加载，但名称未回显。 我必须重新刷新才能回显名称。流有一些问题。帮助？
解决方案
设置cookie时，不会填充 $ _ COOKIE 在该网页加载，因为该变量从浏览器发送给您的负载。一个解决方法是在 setcookie 语句后面设置 $ _ COOKIE ['name'] = $ name; 但这不保证浏览器接受并实际设置cookie  - 只是一种方法，使其立即可用您的脚本。
 
I know this might be an extremely beginner level question but I am just a month into PHP so please bear with me. I am trying to set a cookie in a WordPress blog. The cookie receives its value from URL. "http://www.xyz.com/?name=John"

This is how the cookie is being set: 
function set_name_cookie() {
    if (isset($_GET['name'])) {
        $name = $_GET['name'];
        setcookie("name", $name, time()+3600, "/", ".xyz.com", false);
    }
}
add_action( 'init', 'set_name_cookie');
HTML + PHP:
<?php if(isset($_COOKIE['name'])) {
      $name = $_COOKIE['name'];
      echo $name; 
?>
<a href="?name=John">John</a>
<a href="?name=Smith">Smith</a>
The problem is, when I click the either of the links "John" or "Smith", the page loads but the name is not echoed. I have to refresh again for the name to echo. There is some problem with the flow. Help?
解决方案
When you set a cookie, it doesn't populate $_COOKIE on that page load, as that variable is loaded from what the browser sends you.  A workaround for that would be to set $_COOKIE['name'] = $name; after your setcookie statement - but that does not guarantee that the browser accepted and actually set the cookie - just a way to make it available immediately in your script.

                        
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